miosis
/mʌɪˈəʊsɪs
/(also myosis)
noun [mass noun]
Excessive constriction of the pupil of the eye.Symptoms include nasal congestion, ptosis of one eyelid, miosis, and conjunctional hyperemia....
- Oral pilocarpine is contraindicated in patients with uncontrolled asthma and in patients in whom miosis is undesirable, such as patients with acute iritis or narrow angle (angle closure) glaucoma.
- After inhalation of vapour, respiratory symptoms, dimming of vision, and miosis are generally the first clinical features to appear.
Derivatives
miotic
- Its pharmacology accounts for its analgesic and antitussive properties, along with adverse effects such as respiratory depression, decreased bowel motility, miotic pupils, nausea and hypotension.
- Since the pupillary sphincter is not receiving blood, neither light nor a miotic agent produces miosis.
- Although topical miotic drops or gel preparations are poorly tolerated by younger patients due to induced myopia and accommodative spasm, pilocarpine Ocuserts are extremely well tolerated.
Origin
Early 19th century: from Greek muein 'shut the eyes' + -osis.